Area under the curves B cell epitope Best model COVID-19 vaccines Cross validation Decision trees Dipeptide composition Exosomes Feature vectors Forecasting Golgi Apparatus Golgi complex Peptides Protein Sorting Signals Protein Transport Protein secretion Proteins Random forests SARS-CoV-2 variants of concern Signal peptide T cell epitope Web-based tools exosome immune escape immunodominance metabolism neutralizing antibodies omicron protein protein transport